gnu.crypto.hash

Class MD5

java.lang.Object

gnu.crypto.hash.BaseHash

gnu.crypto.hash.MD5

All Implemented Interfaces:

IMessageDigest, java.lang.Cloneable

public class MD5
extends BaseHash

The MD5 message-digest algorithm takes as input a message of arbitrary length and produces as output a 128-bit "fingerprint" or "message digest" of the input. It is conjectured that it is computationally infeasible to produce two messages having the same message digest, or to produce any message having a given prespecified target message digest.

References:

1. The MD5 Message- Digest Algorithm.
   R. Rivest.

Version:

$Revision: 1.1 $

Field Summary

Fields inherited from class gnu.crypto.hash.BaseHash

blockSize, buffer, count, hashSize, name

Constructor Summary

Constructors

Constructor and Description
MD5() Trivial 0-arguments constructor.

Method Summary

Modifier and Type	Method and Description
java.lang.Object	clone() Returns a clone copy of this instance.
protected byte[]	getResult() Constructs the result from the contents of the current context.
protected byte[]	padBuffer() Returns the byte array to use as padding before completing a hash operation.
protected void	resetContext() Resets the instance for future re-use.
boolean	selfTest() A basic test.
protected void	transform(byte[] in, int i) The block digest transformation per se.

Methods inherited from class gnu.crypto.hash.BaseHash

blockSize, digest, hashSize, name, reset, update, update

Methods inherited from class java.lang.Object

equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

MD5

public MD5()

Trivial 0-arguments constructor.

Method Detail

clone

public java.lang.Object clone()

Description copied from interface: IMessageDigest

Returns a clone copy of this instance.

Specified by:

clone in interface IMessageDigest

Specified by:

clone in class BaseHash

Returns:

a clone copy of this instance.

transform

protected void transform(byte[] in,
                         int i)

Description copied from class: BaseHash

The block digest transformation per se.

Specified by:

transform in class BaseHash

Parameters:

in - the blockSize long block, as an array of bytes to digest.

i - the index where the data to digest is located within the input buffer.

padBuffer

protected byte[] padBuffer()

Description copied from class: BaseHash

Returns the byte array to use as padding before completing a hash operation.

Specified by:

padBuffer in class BaseHash

Returns:

the bytes to pad the remaining bytes in the buffer before completing a hash operation.

getResult

protected byte[] getResult()

Description copied from class: BaseHash

Constructs the result from the contents of the current context.

Specified by:

getResult in class BaseHash

Returns:

the output of the completed hash operation.

resetContext

protected void resetContext()

Description copied from class: BaseHash

Resets the instance for future re-use.

Specified by:

resetContext in class BaseHash

selfTest

public boolean selfTest()

Description copied from interface: IMessageDigest

A basic test. Ensures that the digest of a pre-determined message is equal to a known pre-computed value.

Specified by:

selfTest in interface IMessageDigest

Specified by:

selfTest in class BaseHash

Returns:

true if the implementation passes a basic self-test. Returns false otherwise.